Question

Please explain me the diffusion process in incense sticks please

Answer 1

Some substances (molecules, ions) such as carbon dioxide, oxygen, water etc.,can move across the plasma membrane through a process called diffusion. These substances are of very small size, so, they diffuse readily through the phospholipid layer of the plasma membrane. Thus, diffusion is the spontaneous movement of molecules from a region of high concentration, until uniform concentration is finally achieved. Diffusion is faster in the gaseous phase than in liquids and solids.

Answer 2

We know that the pleasant smell of incense sticks spreads through a room. When an incense stick burns, some volatile compounds present in it evaporate. Molecules of some of these compounds, when inhaled, gives us the sensation of pleasant smell. Therefore, the spreading of odour is due to the diffusion of molecules in gas phase.